R-R - 600-1200ms
PR - 120-200ms
AH - 50-140ms
HV - 40-55ms
QRS - 80-120ms
QT (corrected) -
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A normal distribution simply enables you to convert your values, which are in some measurement unit, to normal deviates. Normal deviates (i.e. z-scores) allow you to use the table of normal values to compute probabilities under the normal curve.
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The data from a normal distribution are symmetric about its mean, not about zero. There is, therefore nothing strange about all the values being negative.
In NORMAL arithmetic, x equals 0
It is the study of algorithms that use numerical values for the problems of continuous mathematics.